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Updated weekly · Last refresh Sep 21

CTOS Data Systems Software Engineer Interview Questions

The questions to prepare for a CTOS Data Systems Software Engineer interview. Questions from real interview reports rank first. Updated daily.

32questions
~4htotal time
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1
ExecutionStart here. 23 questions · ~185 min
Choose Development Methodology for DeliveryEasy

Explain how you choose and apply software development methodologies based on project needs, team structure, and stakeholder expectations.

Trade-offsRoadmappingScope ManagementCTOS Data Systems
Collaborate Across Product and Data ScienceMedium

Explain how you collaborate with product managers and data scientists to align goals, manage trade-offs, and deliver AI work effectively.

CommunicationteamworkCTOS Data Systems
Handling Conflict on a Data ProjectEasy

Describe how you handled a difficult teammate while keeping a data engineering project on track.

Trade-offsRisk AssessmentCTOS Data Systems
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2
SQL & Data Manipulation5 questions + 3 drills · ~70 min
SQL Data Manipulation BasicsMedium

Evaluates understanding of core SQL data manipulation behavior and tradeoffs between TRUNCATE and DELETE.

CTOS Data Systems
Primary Key vs Foreign KeyEasy

Tests knowledge of relational constraints and entity relationships.

JoinsData WranglingCTOS Data Systems
Multi-Table SQL RetrievalEasy

Tests ability to join tables and correctly retrieve relational data.

SubqueriesJoinsData WranglingCTOS Data Systems
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Detect Consecutive Losing StreaksMedium
Practice
Practice drill

Identify bet365 users with consecutive losing bets above a risk threshold using ordered streak grouping.

abuse trackingData Manipulationsql querybet365
Database Trade-Offs for DetectionHard
Practice
Practice drill

Compare financial crime detection architectures using joined run metrics, aggregates, NULL handling, and ordered performance results.

fraud detectionTrade-offsdistributed databasesDeloitte
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3
Coding4 questions · ~32 min
OOP Principles in JavaEasy

Tests understanding of OOP fundamentals and their practical implications in Java.

RecursionArraysCTOS Data Systems
Designing a Class HierarchyMedium

Tests OOP design skills, abstraction choices, and maintainable structure.

RecursionTreesoopCTOS Data Systems
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The finish line: interview-readyComplete all 32 questions plus 3 hands-on drills to finish this plan.